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Messages - aphextwin

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General / Re: Using AE generate ALpha
« on: June 25, 2013, 04:37:55 PM »
Use photoshop "magic wand". Export mask as png via batch.

General / Re: twin cameras processing for aerial photogrametry
« on: June 25, 2013, 09:48:24 AM »
good idea in general. Sure it will work. But the benefit will depend on your application. We tried this with our UAV and two Canon G11 two years ago and it has two major disadvantages:

- at an altitude of >20m (which isn?t much) and parallel cameras the two images are allmost identical

- your UAV has to carry 2 cameras and the plus weight will drain the battery even more

We never tried to increase the angle between the cameras but as I understand the process, camera angles are less important than different camera positions so it would be a better idea to fly smaller rounds (for height-field).

General / Turntable-Question
« on: February 06, 2013, 04:21:00 PM »
Hi there,

when using a turntable the camera-positions are (more or less) known. I.e. when rotating 24 times a camera must be placed every 15 deg.

Now, is there any way to use ground control in connection with this to improve accuracy, quality and speed? Any ideas?

Another question is, when using a lens with a fixed focal length, how can I use a camera calibration I did with Agisoft lens? And does it improve the results?


Python and Java API / Gradual Selection
« on: January 31, 2013, 06:46:03 PM »
Is it possible to perform a gradual selection on a mesh with python? I couldn?t find something in the reference :-/

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